The calculation procedures on the composite three-dimensional construction strength that are reduced to the calculation of the three-dimensional isotropic uniform bodies (constructions) strength with the application of the strength equivalent conditions are offered in the article. The following statement is the core of the offered procedures. For every composite construction V 0 there is such a homogeneous one as V e and such numbers as п а, п b, that if the safety factor п е of V e construction satisfies the equivalent strength conditions п а ≤ п е ≤ п ь, then the safety factor n 0 of V 0 construction satisfies the given strength conditions n 1 ≤ n 0 ≤ n 2, where п 1, n 2 are given, and vice versa. For a number of composite constructions of the regular structure the procedures for constructing the isotropic homogeneous constructions and the equivalent safety conditions are shown.
safety factor, composites, homogeneous bodies, equivalent in strength constructions, elasticity problem, equivalent strength conditions, finite element method
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